Component documentation for the 2SC4425 in a 102 KB PDF. The JIS prefix 2SC denotes an NPN bipolar transistor, which points to datasheet content rather than a device schematic, despite the category label. Repair use typically means confirming pinout before in-circuit diode-mode testing, checking ratings when hunting an equivalent, and reading the package drawing to match the footprint. No other details such as manufacturer or version appear in the name, so compare it with the marking on the part being replaced.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @cyberlanelectonik. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.